Overview: NCP81245 Three-Rail Output Controller with Single Intel Proprietary Interface for Desktop and Notebook CPU Applications www.onsemi.com The NCP81245 (3+3+1 phase) three−output buck solution is optimized for Intel’s IMVP8 CPUs.
The two multi−phase rail control systems are based on Dual−Edge pulse−width modulation (PWM) combined with DCR current sensing providing an ultra fast initial response to dynamic load events and reduced system cost.
The single−phase rail makes use of ON Semiconductor’s patented high performance RPM operation. RPM control maximizes transient response while allowing for smooth transitions between discontinuous−frequency−scaling operation and continuous−mode full−power operation. The NCP81245 has an ultra−low offset current monitor amplifier with programmable offset compensation for high−accuracy current monitoring.
Three−Phase Rails Feature
• Dual Edge Modulation for Fastest Initial Response to Transient
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• High Performance Operational Error Amplifier • Digital Soft Start Ramp • Dynamic Reference Injection • Accurate Total Summing Current Amplifier • Dual High Impedance Differential Voltage and Total Current Sense
Amplifiers
• Phase−to−Phase Dynamic Current Balancing • True Differential Current Balancing Sense Amplifiers for Each Phase • Adaptive Voltage Positioning (AVP) • Switching Frequency Range of 300 kHz − 750 kHz • Vin range 4.5 V to 20 V • Startup into Pre−Charged Loads While Avoiding False OVP • UltraSonic Operation • These Devices are Pb−Free and are RoHS Compliant MARKING DIAGRAM 1 52
QFN52 MN SUFFIX CASE 485BE NCP81245 FAWLYYWW
G F = Wafer Fab A = Assembly Site WL = Lot ID YY = Year WW = Work Week G = Pb−Free Package ORDERING INFORMATION Device Package Shipping† NCP81245MNTXG QFN52 2500 / Tape (Pb−Free) & Reel †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specification Brochure, BRD8011/D.
